Improvement in countersinks



W. H. LAUGHLIN.

COUNTERSINKS. N.o.178,448. Patented June 6,1'8'76.

W171i asses,

UNITED STATES PATENT OFFICE.

WILLIAM H. LAUGHLIN, OF HINGKLEY, OHIO.

IMPROVEMENT IN COUNTERSINKS.

Specification forming part of Letters Patent No. 178,448, dated J une 6,1876; application filed September 11, 1875.

To all whom it mag concern:

Be it known that I, W'ILLIAM H. LAUGIP LIN, of Hinckley, in the countyof Medina and State of Ohio, have invented a Countersink, of which thefollowing is a specification:

This invention relates to a device to be attached to a gimlet orauger-bit, whereby the countersink for a screw or bolt head may be cutat the same time and by the one operation of boring with the bit. Itconsists of a sleeve to be slipped onto the bit, and secured in thedesired position thereon by a set-screw, and which is provided at itslower end with a detachable cutting-lip, as hereinafter described. Thedevice is also provided with an adjustable stop, to provide for cuttingthe countersink to any required depth. p

To enable others to fully understand my invention, I proceed to describethe same in detail with the aid of the accompanying draw ing, in whichFigure 1 represents a bit-having my improved countersink attached.Fig.-2 is a detached view of the sleeve with the cutting-lip detached.Fig. 3 is the detached lip. Fig. 4 is a reverse side view of theaforesaid sleeve and cutting-lip, showing the adjustable stop. Fig. 5 isan end view of the same. Fig. 6 represents a modified construction ofthe cuttinglip designed for cutting a plug-seat, together with thecountersink.

A, Fig. 1, is a bit, which may be of the ordinary construction. B isasleeve, having a longitudinal opening through it large enough toaccommodate different-sized bits, and is partly cut away on one side,leaving a portion at the central part, in which is placed a setscrew, 0,for securing the device to the bit. The lower part of sleeve B has acone-shaped projection, in which is formed a seat to receive acone-shaped countersinkcutter, D. (Seen in detached view, Fig. 3.) Thecutter D has a cutting-lip, d, which passes down to a point, so as tocome into contact with the bit, whether the same be a large or smallsized bit. The cavity in the said cutter D is not wardly-projectingcutting-lip, d This cutter is designed for cutting a plug-seat togetherwith the countersink.

On one side of the sleeve is attached an adjustable stop, E, consistingof a slotted plate having a shoulder and projection, the point of whichrests in a small groove in the side of the cone. Said plate is securedin place by a set-screw, c. This stop may be adjusted to allow thecountersink to be cut any required depth, or turned up out of the way ifnot required for use.

This is a perfect device for cutting countersinks for screws orbolt-heads, and is "cry economical, from the fact that it is readilyadapted to difl'erent-sized bits.

This device may be constructed in one piece instead of having thecutting-lips detachable, if desired, but it is preferable to make lipsdetachable on the score of economy.

Having described my invention, I claim The herein described countersinkcutting device, consisting of the sleeve B, provided with the detachablecutter D, set-screw O, and

stop E, combined and arranged totoperate with the boring-bit A,substantially in the manner set forth.

WM. H. LAUGHLIN.

